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[PATCH v2 3/4] PM: Print wall time at suspend & hibernate entry and exit

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  [PATCH v2 3/4] PM: Print wall time at suspend & hibernate entry and exit Mark Salyzyn <salyzyn@android.com> - 2017-07-19 21:50 +0200
    Re: [PATCH v2 3/4] PM: Print wall time at suspend & hibernate entry  and exit "Rafael J. Wysocki" <rafael@kernel.org> - 2017-07-19 22:50 +0200
      Re: [PATCH v2 3/4] PM: Print wall time at suspend & hibernate entry  and exit Mark Salyzyn <salyzyn@android.com> - 2017-07-19 23:30 +0200
        Re: [PATCH v2 3/4] PM: Print wall time at suspend & hibernate entry  and exit "Rafael J. Wysocki" <rafael@kernel.org> - 2017-07-19 23:40 +0200

#1692160 — [PATCH v2 3/4] PM: Print wall time at suspend & hibernate entry and exit

Permits power state and battery life diagnosis.

Since one is not guaranteed to have a persistent hardware clock to
report Suspended for in milliseconds, we report at a higher level
at just the entry and exit points for suspend and hibernate.

Feature activated by CONFIG_RTC_SHOW_TIME_*

Signed-off-by: Mark Salyzyn <salyzyn@android.com>

v2:
- merge suspend and hibernate into a single patch
---
 kernel/power/hibernate.c | 4 +++-
 kernel/power/suspend.c   | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index e1914c7b85b1..0b5460f9189b 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -32,11 +32,11 @@
 #include <linux/ctype.h>
 #include <linux/genhd.h>
 #include <linux/ktime.h>
+#include <linux/rtc.h>
 #include <trace/events/power.h>
 
 #include "power.h"
 
-
 static int nocompress;
 static int noresume;
 static int nohibernate;
@@ -342,6 +342,7 @@ int hibernation_snapshot(int platform_mode)
 	pm_message_t msg;
 	int error;
 
+	rtc_show_time("PM: hibernation entry");
 	pm_suspend_clear_flags();
 	error = platform_begin(platform_mode);
 	if (error)
@@ -409,6 +410,7 @@ int hibernation_snapshot(int platform_mode)
 	thaw_kernel_threads();
  Cleanup:
 	swsusp_free();
+	rtc_show_time("PM: hibernation exit");
 	goto Close;
 }
 
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 3ecf275d7e44..f44d2152ab3f 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -26,6 +26,7 @@
 #include <linux/suspend.h>
 #include <linux/syscore_ops.h>
 #include <linux/ftrace.h>
+#include <linux/rtc.h>
 #include <trace/events/power.h>
 #include <linux/compiler.h>
 #include <linux/moduleparam.h>
@@ -579,6 +580,7 @@ int pm_suspend(suspend_state_t state)
 	if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
 		return -EINVAL;
 
+	rtc_show_time("PM: suspend entry");
 	error = enter_state(state);
 	if (error) {
 		suspend_stats.fail++;
@@ -586,6 +588,7 @@ int pm_suspend(suspend_state_t state)
 	} else {
 		suspend_stats.success++;
 	}
+	rtc_show_time("PM: suspend exit");
 	return error;
 }
 EXPORT_SYMBOL(pm_suspend);
-- 
2.14.0.rc0.284.gd933b75aa4-goog

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#1692190 — Re: [PATCH v2 3/4] PM: Print wall time at suspend & hibernate entry and exit

On Wed, Jul 19, 2017 at 9:45 PM, Mark Salyzyn <salyzyn@android.com> wrote:
> Permits power state and battery life diagnosis.
>
> Since one is not guaranteed to have a persistent hardware clock to
> report Suspended for in milliseconds, we report at a higher level
> at just the entry and exit points for suspend and hibernate.
>
> Feature activated by CONFIG_RTC_SHOW_TIME_*
>
> Signed-off-by: Mark Salyzyn <salyzyn@android.com>
>
> v2:
> - merge suspend and hibernate into a single patch

So now I guess you realize that this conflicts with
https://patchwork.kernel.org/patch/9850217/ and it actually would make
sense for it to go on top of that?

Thanks,
Rafael

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#1692204 — Re: [PATCH v2 3/4] PM: Print wall time at suspend & hibernate entry and exit

On 07/19/2017 01:40 PM, Rafael J. Wysocki wrote:
> On Wed, Jul 19, 2017 at 9:45 PM, Mark Salyzyn <salyzyn@android.com> wrote:
>> Permits power state and battery life diagnosis.
>>
>> Since one is not guaranteed to have a persistent hardware clock to
>> report Suspended for in milliseconds, we report at a higher level
>> at just the entry and exit points for suspend and hibernate.
>>
>> Feature activated by CONFIG_RTC_SHOW_TIME_*
>>
>> Signed-off-by: Mark Salyzyn <salyzyn@android.com>
>>
>> v2:
>> - merge suspend and hibernate into a single patch
> So now I guess you realize that this conflicts with
> https://patchwork.kernel.org/patch/9850217/ and it actually would make
> sense for it to go on top of that?
>
> Thanks,
> Rafael

I see. It would make sense to merge the concepts a bit since the prints 
are at the same locations.

Optimization idea: rtc_show_time() in my patch series should be able to 
support varargs, never be _disabled_ (CONFIG_RTC_SHOW_TIME_NONE idea is 
dropped) and the function would be a drop-in replacement for pr_info, 
but add the specified timestamp before the newline. Change it's name to 
pr_info_show_time() instead to reflect this adjustment.

I would also prefer that the base messages in patch/980217 be "PM: 
suspend entry" and "PM: suspend exit", only because I believe 1.6billion 
Linux devices would not need to be retooled, and besides these messages 
are shorter/sweeter.

Anyone disagree with some more over-engineering (pr_info_show_time() and 
varargs)

-- Mark

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#1692214 — Re: [PATCH v2 3/4] PM: Print wall time at suspend & hibernate entry and exit

On Wed, Jul 19, 2017 at 11:23 PM, Mark Salyzyn <salyzyn@android.com> wrote:
> On 07/19/2017 01:40 PM, Rafael J. Wysocki wrote:
>>
>> On Wed, Jul 19, 2017 at 9:45 PM, Mark Salyzyn <salyzyn@android.com> wrote:
>>>
>>> Permits power state and battery life diagnosis.
>>>
>>> Since one is not guaranteed to have a persistent hardware clock to
>>> report Suspended for in milliseconds, we report at a higher level
>>> at just the entry and exit points for suspend and hibernate.
>>>
>>> Feature activated by CONFIG_RTC_SHOW_TIME_*
>>>
>>> Signed-off-by: Mark Salyzyn <salyzyn@android.com>
>>>
>>> v2:
>>> - merge suspend and hibernate into a single patch
>>
>> So now I guess you realize that this conflicts with
>> https://patchwork.kernel.org/patch/9850217/ and it actually would make
>> sense for it to go on top of that?
>>
>> Thanks,
>> Rafael
>
>
> I see. It would make sense to merge the concepts a bit since the prints are
> at the same locations.

Exactly.

> Optimization idea: rtc_show_time() in my patch series should be able to
> support varargs, never be _disabled_ (CONFIG_RTC_SHOW_TIME_NONE idea is
> dropped) and the function would be a drop-in replacement for pr_info, but
> add the specified timestamp before the newline. Change it's name to
> pr_info_show_time() instead to reflect this adjustment.
>
> I would also prefer that the base messages in patch/980217 be "PM: suspend
> entry" and "PM: suspend exit", only because I believe 1.6billion Linux
> devices would not need to be retooled, and besides these messages are
> shorter/sweeter.

I can change the messages in patch/980217 if that helps.

> Anyone disagree with some more over-engineering (pr_info_show_time() and
> varargs)

Hmm, do it as a macro maybe?

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